Say it ain't so! It's so. The Japanese - who else! - are falling for this fashion accessory, mini LED lights affixed right behind your teeth so that when you grin, your teeth are all lit up.
You can flash, change colors, have all kinds of effects.
The idea was brought forth for an ad campaign but now it's catching on and youngsters are walking the streets with these things. Look Japan, just because you
can do something like this doesn't mean you
should.
Hopefully this is temporary.
NY Times